2GXU:
reference: Crystal Structure and Nucleotide Binding of the Thermus thermophilus RNA Helicase Hera N-terminal Domain., Rudolph MG, Heissmann R, Wittmann JG, Klostermeier D, J Mol Biol. 2006 Aug 25;361(4):731-43. Epub 2006 Jul 12. PMID: 16890241

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